[sdiy] Polymoog resonator question

Donald Tillman don at till.com
Sat Oct 6 10:34:17 CEST 2018

> On Oct 6, 2018, at 1:03 AM, David G Dixon <dixon at mail.ubc.ca> wrote:
>> And it is somewhat compensated for in those resistor mixdowns 
>> before the 4016.
> I haven't really looked at that part of the circuit too closely yet, but I
> am intrigued by the "E" output, which seems just to add an inverted version
> of the middle resonator's BP output to the other BP outputs.  I wonder how
> cool that sounds.

Good question; the "E" output isn't available on the standard Polymoog. (!!!)

The "E" output is the sum of the three bandpass responses with the middle one inverted.

> Also, I'll probably add a fourth resonator (and change the
> frequency ranges accordingly) because I need two 2164 VCAs for each
> resonator, so I'll have two spares.  I've figured out a way to build each
> resonator with one quad and half of a 2164, and that includes both manual
> and CV control of frequency, so the layout will be very efficient 

Dude named his first born "2164".  :-)

  -- Don
Donald Tillman, Palo Alto, California

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